Question

我找到了一个脚本，可以在Opera的鼠标手势上添加鼠标轨迹。非常好，但有一个问题。它会检测鼠标按钮何时关闭并开始绘制线条但是它不会检测何时释放鼠标按钮。跟踪显示一段时间（1秒）。是否可以更新脚本，以便只要按下按钮鼠标就会在屏幕上显示轨迹？

该脚本位于http://extendopera.org/userjs/content/gesture-tails

var GestureTrail={
//options:
  opacity:1,
  color:'#f27',


        canvas:null,
        _2d:null,
        start:null,
        cur:null,
        isdown:false,
        init:function(){

        /* create a transparent canvas element the size of
           the full window and insert it into the document */
          var canvas=document.createElement('canvas');
          canvas.height=window.innerHeight;
          canvas.width=window.innerWidth;
          document.body.appendChild(canvas);
          canvas.style="position:fixed;top:0;display:none;z-index:-999;left:0;opacity:"+this.opacity+";";
          this.canvas=canvas;

        /* grab the 2d methods for the canvas element */
          this._2d=this.canvas.getContext('2d');

    window.addEventListener("mousemove",function(e){GestureTrail.draw(e);},0);
    window.addEventListener("mouseup",function(e){GestureTrail.release();},0);
        },
        click:function(e){
          if(e.button!=2){return true;} // if not rightclick
          this.start={x:e.clientX,y:e.clientY}; // set the line start-point to the mouse position
                this._2d.strokeStyle=this.color;
          this.isdown=true;
          setTimeout(function(){GestureTrail.release();},1000); // thanks to Somh for thinking of this
          },
        draw:function(e){
          if(!this.isdown){return;} // if the mouse isn't down
          this.canvas.style.zIndex="999";    // bring the canvas element to the top 
          this.canvas.style.display="block"; /* (must be done on move - if done on mousedown
                                                it obscures text selection (HotClick) context menu) */
                this.cur={x:e.clientX,y:e.clientY}; // set point to begin drawing from
    this._2d.beginPath();
                this._2d.moveTo(this.start.x,this.start.y);
                this._2d.lineTo(this.cur.x,this.cur.y);
                this._2d.stroke();
    this.start=this.cur; /* sets the startpoint for the next mousemove to the
                             current point, otherwise the line constantly restarts
                             from the first point and you get a kind of fan-like pattern */
        },
        release:function(){
          this._2d.clearRect(0,0,window.innerWidth,window.innerHeight); // wipe the trails from the entire window
          this.isdown=false;
          this.canvas.style.zIndex="-999"; // send the canvas element back down below the page
          }
};

window.opera.addEventListener("BeforeEvent.mousedown",function(e){GestureTrail.click(e.event);},0);
window.addEventListener('DOMContentLoaded',function(){GestureTrail.init();},0);

Answer 1

删除：

  setTimeout(function(){GestureTrail.release();},1000); // thanks to Somh for thinking of this

点击功能结束时的那些。这应该是全部

但这是一个真正的编程问题的网站，而不是客户在没有付款的情况下寻找程序来完成他们的工作

帮助修改JavaScript脚本

1 个答案: